What’s the best piece of advice you’ve ever received?

I was at a friend’s wedding in my early 20’s, chatting to the official photographer while we awaited the bride. I commented that I wanted to save up enough money to replace my little Kodak Instamatic with a camera more like his. All he said, at first, was:
Cameras don’t take photos
I was shocked until he added:
People do.
He made the point that having a better camera will not improve your photos. Then he expanded his advice
Taking good photos is about composition and lighting. Learn to take good photos with your little Instmatic first. Then, when you’re happy with them, buy the best camera you can afford.
It was good advice that I transferred to the rest of my life. Learn to use what you have to the best of your ability. Then buy the best that you can afford.
It’s saved me a lot of money over the years.